Sniffing leak detector

Abstract

A sniffing leak detector which comprises a first suction line in a sniffing probe, the line leading to a main device, is provided with a larger second suction line through which gas is sucked in from the sniffing tip by a gas delivery pump. By connecting the second suction line, the distance sensitivity is increased. By disconnecting the second suction line, on the other hand, the sensitivity is increased. Thus, it is possible to first search for leaks by use of a high gas throughput and subsequently exactly determine the leaks under the quantitative aspect by use of a reduced flow.

What is claimed is: 
     
       1. A sniffing leak detector comprising a sniffing probe which, via a first suction line leading to a test gas sensor, is connected to a main device including a vacuum pump device, wherein the sniffing probe is provided with a second suction line which is separate from and has a higher conveying capacity than the first suction line so that the first and second suction lines can be simultaneously open, and that said second suction line can be shut off and, without connection to the test gas sensor, is directly connected to a gas conveying pump for conveyance into an environment outside of the detector,
 wherein the second suction line is connected to the gas conveying pump included in the main device, and 
 wherein, within the main device, a pump device comprising a vacuum pump and the gas conveying pump is provided for generating a vacuum for the test gas sensor, and that the second suction line is connected to the gas conveying pump. 
 
     
     
       2. The sniffing leak detector according to  claim 1 , wherein the sniffing probe comprises a handle which is provided with or connected to the second suction line. 
     
     
       3. The sniffing leak detector according to  claim 1 , wherein the conveying capacity of the second and first suction lines have a mutual ratio of at least 5:1. 
     
     
       4. The sniffing leak detector according to  claim 1 , wherein the test gas sensor is arranged in the main device. 
     
     
       5. The sniffing leak detector according to  claim 1 , wherein the conveying capacity of the second and first suction lines have a mutual ratio of at least 10:1.